Organic light emitting diode and organic light emitting diode display

Abstract

An organic light emitting element including: a first electrode; a bump partially covering an end of the first electrode and having an island shape, which has a thickness larger than a thickness of the first electrode; an organic emission layer on the first electrode and the bump; and a second electrode on the organic emission layer.

What is claimed is: 
     
       1. An organic light emitting element comprising:
 a first electrode; 
 a bump partially covering an end of the first electrode and having an island shape, which has a thickness larger than a thickness of the first electrode; 
 an organic emission layer on the first electrode and the bump; and 
 a second electrode on the organic emission layer, 
 wherein the bump has a curved surface, and wherein the curved surface of the bump comprises: 
 a first sub-curved surface contacting a surface of the first electrode and forming a first angle with the surface of the first electrode; and 
 a second sub-curved surface that has a bend, extends from the first sub-curved surface, and forms a second angle with the surface of the first electrode that is larger than the first angle. 
 
     
     
       2. The organic light emitting element of  claim 1 , wherein
 the first electrode is light transmissive, and the second electrode is light reflective. 
 
     
     
       3. The organic light emitting element of  claim 2 , wherein
 the bump has a small refractive index as compared with a refractive index of the organic emission layer and a refractive index of the first electrode. 
 
     
     
       4. The organic light emitting element of  claim 3 , wherein
 the bump has a refractive index of about 1.5 to about 1.6. 
 
     
     
       5. The organic light emitting element of  claim 3 , wherein
 a thickness of the bump is in a range of about 0.8 μm to about 3.5 μm. 
 
     
     
       6. The organic light emitting element of  claim 3 , wherein
 a width of the bump is in a range of about 5 μm to about 6 μm. 
 
     
     
       7. The organic light emitting element of  claim 3 , wherein the first angle is in a range of about 10 degrees to about 37 degrees, and the second angle is in a range of about 38 degrees to about 80 degrees. 
     
     
       8. The organic light emitting element of  claim 3 , wherein the bump comprises:
 a first sub-bump having the first sub-curved surface; and 
 a second sub-bump on the first sub-bump and having the second sub-curved surface. 
 
     
     
       9. The organic light emitting element of  claim 8 , wherein
 the first sub-bump and the second sub-bump have different refractive indexes. 
 
     
     
       10. The organic light emitting element of  claim 1 , wherein
 the organic emission layer is configured to emit white light. 
 
     
     
       11. The organic light emitting element of  claim 1 , wherein
 the first electrode, the organic emission layer, and the second electrode respectively have different refractive indexes. 
 
     
     
       12. An organic light emitting diode (OLED) display comprising:
 a substrate; and 
 an organic light emitting element on the substrate and comprising: 
 a first electrode; 
 a bump partially covering an end of the first electrode and having an island shape, which has a thickness larger than a thickness of the first electrode; 
 an organic emission layer on the first electrode and the bump; and 
 a second electrode on the organic emission layer, 
 wherein the bump has a curved surface, and 
 wherein the curved surface of the bump comprises: 
 a first sub-curved surface contacting a surface of the first electrode and forming a first angle with the surface of the first electrode; and 
 a second sub-curved surface that has a bend, extends from the first sub-curved surface, and forms a second angle with the surface of the first electrode that is larger than the first angle. 
 
     
     
       13. The organic light emitting diode display of  claim 12 , further comprising
 a color filter layer between the substrate and the organic light emitting element.